JP6936156B2

JP6936156B2 - scarf

Info

Publication number: JP6936156B2
Application number: JP2018011853A
Authority: JP
Inventors: 聖司近藤; 隼多和田; 貝沼　克彦; 克彦貝沼
Original assignee: Futaba Industrial Co Ltd
Current assignee: Futaba Industrial Co Ltd
Priority date: 2018-01-26
Filing date: 2018-01-26
Publication date: 2021-09-15
Anticipated expiration: 2038-01-26
Also published as: JP2019127932A

Description

本開示は、マフラに関する。 The present disclosure relates to mufflers.

車両に搭載されるマフラでは、閉管共鳴による共鳴音が発生する。特許文献１には、この共鳴音を低減可能なマフラが開示されている。すなわち、特許文献１に記載のマフラは、ケーシングと、セパレータと、共鳴部と、を備える。ケーシングは、排気音を低減するための排気流路を内部に有する。セパレータは、ケーシングの内壁面に囲まれた内部空間を複数の室に仕切る。共鳴部は、セパレータに設けられ、その長手方向の一端部が上記複数の室の１つに開口し、他端部が覆われるサイドブランチ型共鳴器を形成する。 In the muffler mounted on the vehicle, resonance sound is generated by closed tube resonance. Patent Document 1 discloses a muffler capable of reducing this resonance sound. That is, the muffler described in Patent Document 1 includes a casing, a separator, and a resonance portion. The casing has an exhaust flow path inside for reducing exhaust noise. The separator divides the internal space surrounded by the inner wall surface of the casing into a plurality of chambers. The resonance portion is provided on the separator, and one end portion in the longitudinal direction thereof opens into one of the plurality of chambers to form a side branch type resonator in which the other end portion is covered.

特開２００２−２７６３２９号公報Japanese Unexamined Patent Publication No. 2002-276329

しかしながら、特許文献１に記載のマフラでは、上記共鳴部がセパレータに設けられる。このため、マフラの伸張方向等に発生する共鳴音を低減するには、上記共鳴部の長手方向の長さを適切に確保できない場合がある。また、内燃機関から排出される排ガスには、周期的な圧力の変化（脈動圧）が存在する。そして、マフラ内に導入される排ガスの脈動圧によりケーシングは振動し、音（放射音）が発生する。特許文献１に記載のマフラでは、この放射音を抑制することについて何ら考慮されていない。 However, in the muffler described in Patent Document 1, the resonance portion is provided in the separator. Therefore, in order to reduce the resonance sound generated in the extension direction of the muffler or the like, it may not be possible to appropriately secure the length of the resonance portion in the longitudinal direction. Further, the exhaust gas discharged from the internal combustion engine has a periodic pressure change (pulsating pressure). Then, the casing vibrates due to the pulsating pressure of the exhaust gas introduced into the muffler, and a sound (radiated sound) is generated. In the muffler described in Patent Document 1, no consideration is given to suppressing this radiated sound.

本開示は、マフラで発生する共鳴音を低減する効果を向上するとともに、マフラのケーシングが振動することで発生する放射音を低減可能なマフラを提供することを目的としている。 An object of the present disclosure is to provide a muffler capable of improving the effect of reducing the resonance sound generated by the muffler and reducing the radiated sound generated by the vibration of the casing of the muffler.

本開示の一態様は、マフラであって、ケーシングと、消音部材と、を備える。ケーシングは、排気音を低減するための排気流路を内部に有する。消音部材は、ケーシングの内壁面に沿って配置される。消音部材は、壁部と、開口部と、を備える。壁部は、第１の方向に沿って延在し、第１の方向に沿って窪み部を形成する板状の部位である。開口部は、壁部に形成され、窪み部とケーシングの内壁面とにより覆われた空間である消音空間と、ケーシングの内壁面に囲まれた内部空間のうち消音空間以外の空間と、を連通する。 One aspect of the present disclosure is a muffler, comprising a casing and a muffling member. The casing has an exhaust flow path inside for reducing exhaust noise. The sound deadening member is arranged along the inner wall surface of the casing. The sound deadening member includes a wall portion and an opening portion. The wall portion is a plate-shaped portion that extends along the first direction and forms a recess along the first direction. The opening communicates between a muffling space, which is a space formed in a wall and covered by a recess and an inner wall surface of the casing, and an internal space surrounded by the inner wall surface of the casing other than the muffling space. do.

このような構成によれば、消音部材の第１の方向の長さを適切に設定することで、共鳴音と逆位相の音波を発生させ、共鳴音を低減できる。また、ケーシングの内壁面に沿って消音部材が配置されるため、消音部材がセパレータに搭載される構成と比較して、消音部材の第１の方向の長さを確保できる。よって、上記構成と比較して共鳴音を低減する効果を向上できる。さらには、消音部材がケーシングの内壁面に取り付けられるため、ケーシングの剛性を向上し、ケーシングの振動による放射音を抑制できる。したがって、マフラで発生する共鳴音を低減する効果を向上するとともに放射音を抑制できる。 According to such a configuration, by appropriately setting the length of the sound deadening member in the first direction, a sound wave having a phase opposite to that of the resonance sound can be generated and the resonance sound can be reduced. Further, since the muffling member is arranged along the inner wall surface of the casing, the length of the muffling member in the first direction can be secured as compared with the configuration in which the muffling member is mounted on the separator. Therefore, the effect of reducing the resonance sound can be improved as compared with the above configuration. Further, since the sound deadening member is attached to the inner wall surface of the casing, the rigidity of the casing can be improved and the radiated sound due to the vibration of the casing can be suppressed. Therefore, the effect of reducing the resonance sound generated by the muffler can be improved and the radiated sound can be suppressed.

本開示の一態様では、開口部の開口面積が、消音空間の断面積と略同一でもよい。
また、本開示の一態様では、窪み部における第１の方向の一端部が覆われ、他端部に開口部が形成されていてもよい。 In one aspect of the present disclosure, the opening area of the opening may be substantially the same as the cross-sectional area of the muffling space.
Further, in one aspect of the present disclosure, one end of the recess in the first direction may be covered and an opening may be formed at the other end.

このような構成によれば、ケーシングの両端部の近傍に位置する、共鳴音の音圧の腹に開口部を配置し得る。よって、共鳴音を効果的に低減でき得る。
本開示の一態様では、壁部は、小窪み部と、小窪み部と第１の方向において連続し、小窪み部よりも大きく窪んだ大窪み部と、を窪み部として形成してもよい。そして、小窪み部の第１の方向の大窪み部と反対側の端部に開口部が形成されていてもよい。 According to such a configuration, the opening can be arranged in the antinode of the sound pressure of the resonance sound, which is located near both ends of the casing. Therefore, the resonance sound can be effectively reduced.
In one aspect of the present disclosure, the wall portion may form a small recess portion, a large recess portion that is continuous with the small recess portion in the first direction and is recessed larger than the small recess portion, as a recess portion. .. Then, an opening may be formed at the end of the small recess on the opposite side of the large recess in the first direction.

このような構成によれば、消音部材により、ヘルムホルツ共鳴器を形成できる。このため、特定の周波数の共鳴音を減衰可能となる。
本開示の一態様では、窪み部における第１の方向の両端部が覆われてもよい。そして、開口部が、壁部における窪み部を形成する部分の第１の方向の中央部に形成されていてもよい。 According to such a configuration, the Helmholtz resonator can be formed by the sound deadening member. Therefore, the resonance sound of a specific frequency can be attenuated.
In one aspect of the present disclosure, both ends of the recess in the first direction may be covered. Then, the opening may be formed in the central portion in the first direction of the portion forming the recessed portion in the wall portion.

このような構成によれば、ケーシングの中央部の近傍に位置する、共鳴音の音圧の腹に開口部を配置し得る。よって、共鳴音を効果的に低減でき得る。
本開示の一態様では、消音部材は、第１の方向が直線状である壁部を備え、当該壁部の延在方向がケーシングの伸張方向と一致するように配置されていてもよい。なお、ここでいう「一致」とは、厳密な意味での一致に限るものではなく、目的とする効果を奏するのであれば厳密に一致でなくてもよい。 According to such a configuration, the opening can be arranged in the antinode of the sound pressure of the resonance sound, which is located near the central portion of the casing. Therefore, the resonance sound can be effectively reduced.
In one aspect of the present disclosure, the sound deadening member may include a wall portion whose first direction is linear, and may be arranged so that the extending direction of the wall portion coincides with the extending direction of the casing. The term "match" as used herein is not limited to a match in a strict sense, and may not be a strict match as long as it produces the desired effect.

このような構成によれば、消音部材が、壁部の延在方向とケーシングの伸張方向とが一致しないように位置する構成と比較して、ケーシングの剛性を向上できる。よって、上記構成と比較して、放射音を抑制できる。 According to such a configuration, the rigidity of the casing can be improved as compared with the configuration in which the sound deadening member is located so that the extending direction of the wall portion and the extending direction of the casing do not coincide with each other. Therefore, the radiated sound can be suppressed as compared with the above configuration.

本開示の一態様では、消音部材が、窪み部の一端の縁部に沿って延びるフランジ状の取付け部を備えていてもよい。そして、取付け部がケーシングの内壁面に接合されていてもよい。 In one aspect of the present disclosure, the muffling member may include a flange-shaped attachment that extends along the edge of one end of the recess. Then, the mounting portion may be joined to the inner wall surface of the casing.

このような構成によれば、消音部材がフランジ状の取付け部を有しない構成と比較して、消音部材とケーシングの内壁面との接触面積を向上できる。したがって、上記構成と比較して、ケーシングの剛性を向上させ、放射音を抑制できる。 According to such a configuration, the contact area between the sound deadening member and the inner wall surface of the casing can be improved as compared with a configuration in which the sound deadening member does not have a flange-shaped mounting portion. Therefore, as compared with the above configuration, the rigidity of the casing can be improved and the radiated sound can be suppressed.

本開示の一態様は、ケーシングの内壁面に囲まれた内部空間を仕切るセパレータを更に備えてもよい。セパレータは、フランジ部と、凹部と、を有してもよい。フランジ部は、当該セパレータの外縁部に沿って設けられる。凹部は、消音部材を通す空間である挿通空間をケーシングの内壁面との間に形成する。フランジ部がケーシングの内壁面に接合され、挿通空間に消音部材が通されていてもよい。 One aspect of the present disclosure may further include a separator that partitions an internal space surrounded by an inner wall surface of the casing. The separator may have a flange portion and a recessed portion. The flange portion is provided along the outer edge portion of the separator. The recess forms an insertion space between the inner wall surface of the casing, which is a space for passing the sound deadening member. The flange portion may be joined to the inner wall surface of the casing, and the sound deadening member may be passed through the insertion space.

このような構成によれば、セパレータと消音部材との組付け性を向上させることができる。また、セパレータがフランジ部を有しない構成と比較して、セパレータとケーシングとの接触面積を向上できる。したがって、上記構成と比較して、ケーシングの剛性を向上させ、放射音を抑制できる。 According to such a configuration, the assembling property between the separator and the sound deadening member can be improved. Further, the contact area between the separator and the casing can be improved as compared with the configuration in which the separator does not have a flange portion. Therefore, as compared with the above configuration, the rigidity of the casing can be improved and the radiated sound can be suppressed.

本開示の一態様は、消音部材とケーシングの内壁面との間、及び、消音部材とセパレータとの間、の少なくとも一方に配置された弾性部材を更に備えてもよい。
このような構成によれば、弾性部材がケーシングの振動を吸収するダンパーとして作用するため、放射音を抑制できる。また、弾性部材を弾性変形させて各部材の相対位置を適宜調節できるため、各部材の組付け性を向上できる。 One aspect of the present disclosure may further include elastic members arranged at least one between the muffling member and the inner wall surface of the casing, and between the muffling member and the separator.
According to such a configuration, since the elastic member acts as a damper that absorbs the vibration of the casing, the radiated sound can be suppressed. Further, since the elastic member can be elastically deformed to appropriately adjust the relative position of each member, the assembling property of each member can be improved.

本開示の一態様は、ケーシングの内壁面に沿って配置された追加の消音部材を更に備えてもよい。追加の消音部材は、壁部と、開口部と、を備えてもよい。壁部は、第２の方向に沿って延在し、第２の方向に沿って窪み部を形成する板状の部位である。開口部は、追加の消音部材の壁部に形成され、追加の消音部材の窪み部とケーシングの内壁面とにより覆われた空間である追加の消音空間と、ケーシングの内部空間のうち消音空間以外の空間と、を連通する。 One aspect of the present disclosure may further include additional silencer members arranged along the inner wall surface of the casing. The additional silencer may include a wall and an opening. The wall portion is a plate-shaped portion that extends along the second direction and forms a recess along the second direction. The opening is formed in the wall portion of the additional muffling member, and is a space covered by the recessed portion of the additional muffling member and the inner wall surface of the casing. Communicate with the space of.

このような構成によれば、マフラが消音部材を１つだけ備える構成と比較して、共鳴音を一層抑制できる。 According to such a configuration, the resonance sound can be further suppressed as compared with the configuration in which the muffler includes only one sound deadening member.

図１は、本実施形態のマフラの内部を透過的に示した斜視図である。FIG. 1 is a perspective view showing the inside of the muffler of the present embodiment transparently. 図２は、本実施形態のマフラの内部を透過的に示した上面図である。FIG. 2 is a top view showing the inside of the muffler of the present embodiment transparently. 図３は、図２のIII−III断面図である。FIG. 3 is a sectional view taken along line III-III of FIG. 図４は、図２のIV−IV断面図である。FIG. 4 is a sectional view taken along line IV-IV of FIG. 図５は、閉塞端部に小孔が形成された消音部材を示す図である。FIG. 5 is a diagram showing a sound deadening member in which a small hole is formed at a closed end portion. 図６は、両端部が覆われ、中央部に開口部が形成された消音部材を示す図である。FIG. 6 is a diagram showing a sound deadening member in which both ends are covered and an opening is formed in the center. 図７は、ヘルムホルツ共鳴器を形成可能な消音部材を示す図である。FIG. 7 is a diagram showing a sound deadening member capable of forming a Helmholtz resonator. 図８Ａは、消音部材の断面形状を示す図（１）、図８Ｂは、消音部材の他の断面形状を示す図（２）、図８Ｃは、消音部材の他の断面形状を示す図（３）である。8A is a diagram (1) showing a cross-sectional shape of the sound deadening member, FIG. 8B is a diagram (2) showing another cross-sectional shape of the sound deadening member, and FIG. 8C is a diagram (3) showing another cross-sectional shape of the sound deadening member. ). 図９Ａは、消音部材の閉塞端部の形状を示す図（１）、図９Ｂは、消音部材の閉塞端部の形状を示す図（２）、図９Ｃは、消音部材の閉塞端部の形状を示す図（３）である。9A is a view showing the shape of the closed end portion of the sound deadening member (1), FIG. 9B is a view showing the shape of the closed end portion of the sound deadening member (2), and FIG. 9C is the shape of the closed end portion of the sound deadening member. It is a figure (3) which shows. 図１０は、消音部材の他の配置例を示す図（１）である。FIG. 10 is a diagram (1) showing another arrangement example of the sound deadening member. 図１１は、消音部材の他の配置例を示す図（２）である。FIG. 11 is a diagram (2) showing another arrangement example of the sound deadening member. 図１２は、消音部材の他の配置例を示す図（３）である。FIG. 12 is a diagram (3) showing another arrangement example of the sound deadening member. 図１３は、消音部材の他の形状を示す図（２）である。FIG. 13 is a diagram (2) showing another shape of the sound deadening member. 図１３は、セパレータに孔部が形成されていない場合の消音部材の配置例を示す図である。FIG. 13 is a diagram showing an example of arrangement of the sound deadening member when the hole is not formed in the separator. 図１５Ａは、弾性部材が配置される箇所を示す図、図１５Ｂは、消音部材とケーシングとの間の弾性部材の配置箇所の拡大図、図１５Ｃは、消音部材とセパレータとの間の弾性部材の配置箇所の拡大図である。15A is a view showing a location where the elastic member is arranged, FIG. 15B is an enlarged view of the location where the elastic member is arranged between the sound deadening member and the casing, and FIG. 15C is an enlarged view of the elastic member between the sound deadening member and the separator. It is an enlarged view of the arrangement location of. 図１６Ａは、２つの消音部材と同様の効果を奏し得る１つの部材を示す図、図１６Ｂは、図１６ＡのXVIB−XVIB断面図である。FIG. 16A is a diagram showing one member capable of exerting the same effect as the two sound deadening members, and FIG. 16B is a cross-sectional view taken along the line XVIB-XVIB of FIG. 16A.

以下、図面を参照しながら、本開示を実施するための形態を説明する。
［１．構成］
図１及び図２に示すマフラ１は、車両に搭載され、車両の内燃機関から排出される排ガスの排気流路の一部を構成する。マフラ１は、ケーシング１０と、複数（この例では２つ）のセパレータ１１，１２と、インレットパイプ１３と、アウトレットパイプ１４と、複数（この例では２つ）の消音部材１５，１６と、を備える。
＜ケーシング＞
ケーシング１０は、排気音を低減するための排気流路を内部に有する。ケーシング１０は、シェル部材１０１と、前蓋部材１０２及び後蓋部材１０３と、を備える。シェル部材１０１は、あらかじめ定められた伸張方向１０ａに伸びる筒状の部材である。前蓋部材１０２及び後蓋部材１０３は、シェル部材１０１の伸張方向１０ａの両端開口部を閉塞する。シェル部材１０１の伸張方向１０ａが、ケーシング１０の伸張方向１０ａである。また、図１等では、ケーシング１０の短手方向は符号１０ｂ、鉛直方向は符号１０ｃで示される。
＜セパレータ＞
セパレータ１１，１２（第１セパレータ１１及び第２セパレータ１２）は、ケーシング１０の内壁面に囲まれた内部空間を仕切る部材である。セパレータ１１，１２により、上記内部空間は、複数の室に区画される。本実施形態では、上記内部空間は、後蓋部材１０３側から第１室３１、第２室３２及び第３室３３の３つの室に区画される。 Hereinafter, modes for carrying out the present disclosure will be described with reference to the drawings.
[1. composition]
The muffler 1 shown in FIGS. 1 and 2 is mounted on the vehicle and constitutes a part of the exhaust flow path of the exhaust gas discharged from the internal combustion engine of the vehicle. The muffler 1 includes a casing 10, a plurality of (two in this example) separators 11 and 12, an inlet pipe 13, an outlet pipe 14, and a plurality of (two in this example) sound deadening members 15 and 16. Be prepared.
<Casing>
The casing 10 has an exhaust flow path inside for reducing exhaust noise. The casing 10 includes a shell member 101, a front lid member 102, and a rear lid member 103. The shell member 101 is a cylindrical member that extends in a predetermined extension direction 10a. The front lid member 102 and the rear lid member 103 close the openings at both ends of the shell member 101 in the extension direction 10a. The extension direction 10a of the shell member 101 is the extension direction 10a of the casing 10. Further, in FIG. 1 and the like, the lateral direction of the casing 10 is indicated by reference numeral 10b, and the vertical direction is indicated by reference numeral 10c.
<Separator>
The separators 11 and 12 (first separator 11 and second separator 12) are members that partition an internal space surrounded by an inner wall surface of the casing 10. The interior space is divided into a plurality of chambers by the separators 11 and 12. In the present embodiment, the internal space is divided into three chambers, the first chamber 31, the second chamber 32, and the third chamber 33, from the rear lid member 103 side.

図２及び図３に示すように、第１セパレータ１１は、本体部１１１と、フランジ部１１２と、を有する。本体部１１１は、略楕円状の平板状の部位である。フランジ部１１２は、本体部１１１の外縁部に沿って設けられたフランジ状の部位である。 As shown in FIGS. 2 and 3, the first separator 11 has a main body portion 111 and a flange portion 112. The main body portion 111 is a substantially elliptical flat plate-shaped portion. The flange portion 112 is a flange-shaped portion provided along the outer edge portion of the main body portion 111.

図３に示すように、本体部１１１には、第１室３１と第２室３２とを連通する連通孔１１１ａ，１１１ｂが形成されている。連通孔１１１ａには、アウトレットパイプ１４が挿通される。また本体部１１１には、インレットパイプ１３が挿通される挿通孔１１１ｃが形成されている。 As shown in FIG. 3, the main body 111 is formed with communication holes 111a and 111b that communicate the first chamber 31 and the second chamber 32. An outlet pipe 14 is inserted into the communication hole 111a. Further, the main body 111 is formed with an insertion hole 111c through which the inlet pipe 13 is inserted.

第１セパレータ１１は、凹部１１３を有する。凹部１１３は、挿通空間１１４ａをシェル部材１０の内壁面との間に形成するためのものである。挿通空間１１４ａは、消音部材１５を通す空間である。凹部１１３は、本体部１１１の外周のうち本体部１１１の長手方向（図３の上下方向）に沿った側に設けられる。また、凹部１１３は略半円状に形成されている。特に、凹部１１３は、当該凹部１１３の周方向の両端部（略半円弧の両端部）に、本体部１１１とシェル部材１０１の内壁面との間にわずかな隙間１１３ａを形成するための湾曲部１１３ｂを有する。湾曲部１１３ｂにより形成される隙間１１３ａには、後述する消音部材１５のフランジ状の取付け部１５２が通される。 The first separator 11 has a recess 113. The recess 113 is for forming an insertion space 114a between the insertion space 114a and the inner wall surface of the shell member 10. The insertion space 114a is a space through which the sound deadening member 15 passes. The recess 113 is provided on the outer circumference of the main body 111 along the longitudinal direction (vertical direction in FIG. 3) of the main body 111. Further, the recess 113 is formed in a substantially semicircular shape. In particular, the recess 113 is a curved portion for forming a slight gap 113a between the main body 111 and the inner wall surface of the shell member 101 at both ends of the recess 113 in the circumferential direction (both ends of a substantially semicircular arc). It has 113b. A flange-shaped mounting portion 152 of the sound deadening member 15, which will be described later, is passed through the gap 113a formed by the curved portion 113b.

第２セパレータ１２は、基本的な構造は第１セパレータ１１と同様であるため、説明を省略する。なお、第２セパレータ１２は、本体部１２１と、フランジ部１２２と、を有する。
＜インレットパイプ＞
インレットパイプ１３は、内燃機関からの排ガスをケーシング１０内に導入するためのパイプである。インレットパイプ１３は、前蓋部材１０２、第２セパレータ１２及び第１セパレータ１１を貫通して設けられている。インレットパイプ１３の下流端は、第１室３１に開口している。
＜アウトレットパイプ＞
アウトレットパイプ１４は、図示しないマフラ１の下流にあるパイプに接続されて排ガスをケーシング１０から排出するためのパイプである。アウトレットパイプ１４は、後蓋部材１０３、第１セパレータ１１及び第２セパレータ１２を貫通して設けられている。アウトレットパイプ１４の上流端は、第３室３３に開口している。
＜消音部材＞
消音部材１５，１６（第１消音部材１５及び第２消音部材１６）は、ケーシング１０（具体的にはシェル部材１０１）の内壁面に沿って配置される。消音部材１５，１６は、ケーシング１０を内部から補強するとともに、ケーシング１０の内部にサイドブランチ型共鳴器を形成するために設けられる。 Since the basic structure of the second separator 12 is the same as that of the first separator 11, description thereof will be omitted. The second separator 12 has a main body portion 121 and a flange portion 122.
<Inlet pipe>
The inlet pipe 13 is a pipe for introducing the exhaust gas from the internal combustion engine into the casing 10. The inlet pipe 13 is provided so as to penetrate the front lid member 102, the second separator 12, and the first separator 11. The downstream end of the inlet pipe 13 opens into the first chamber 31.
<Outlet pipe>
The outlet pipe 14 is a pipe connected to a pipe downstream of the muffler 1 (not shown) to discharge the exhaust gas from the casing 10. The outlet pipe 14 is provided so as to penetrate the rear lid member 103, the first separator 11, and the second separator 12. The upstream end of the outlet pipe 14 opens into the third chamber 33.
<Silent member>
The sound deadening members 15 and 16 (the first sound deadening member 15 and the second sound deadening member 16) are arranged along the inner wall surface of the casing 10 (specifically, the shell member 101). The sound deadening members 15 and 16 are provided to reinforce the casing 10 from the inside and to form a side branch type resonator inside the casing 10.

第１消音部材１５は、壁部１５１と、取付け部１５２と、開口部１５３と、を備える。
壁部１５１は、ケーシング１０の内壁面の第１の方向（本実施形態では一直線状の方向）１５ａに沿って延在する。また、壁部１５１は、第１の方向１５ａに沿って窪み部１５１ａを形成する板状の部位である。すなわち、壁部１５１は、第１の方向１５ａに沿って伸びた細長い形状である。窪み部１５１ａにおける第１の方向１５ａの一端部は覆われ、他端部には開口部１５３が形成されている。具体的には、壁部１５１は、胴体部１５１ｂと閉塞部１５１ｃとを有する。 The first sound deadening member 15 includes a wall portion 151, a mounting portion 152, and an opening 153.
The wall portion 151 extends along a first direction (a linear direction in this embodiment) 15a of the inner wall surface of the casing 10. Further, the wall portion 151 is a plate-shaped portion that forms a recessed portion 151a along the first direction 15a. That is, the wall portion 151 has an elongated shape extending along the first direction 15a. One end of the recess 151a in the first direction 15a is covered, and the other end is formed with an opening 153. Specifically, the wall portion 151 has a body portion 151b and a closing portion 151c.

胴体部１５１ｂは、第１の方向１５ａに沿って伸びた長手方向を有する。胴体部１５１ｂは、図８Ａに示すように、第１の方向１５ａに垂直な断面における断面形状が略Ｕ字状（具体的には半円弧状）である。また、胴体部１５１ｂの内径は、第１の方向１５ａに沿って略一定である。なお、図８Ａは、図２のIII−III断面の図である。 The body portion 151b has a longitudinal direction extending along the first direction 15a. As shown in FIG. 8A, the body portion 151b has a substantially U-shaped cross section (specifically, a semicircular arc shape) in a cross section perpendicular to the first direction 15a. Further, the inner diameter of the body portion 151b is substantially constant along the first direction 15a. Note that FIG. 8A is a cross-sectional view taken along the line III-III of FIG.

閉塞部１５１ｃは、胴体部１５１ｂの長手方向の一端部を覆う。閉塞部１５１ｃは、第１の方向１５ａに垂直な断面における断面形状が略Ｕ字状（具体的には半円弧状）である。また、閉塞部１５１ｃは、胴体部１５１ｂと反対側に同心円状に縮径する。この閉塞部１５１ｃ（すなわち、第１消音部材１５の閉塞端部）の外形は、図９Ａに示すように、側面視で１／４円弧状である。一方、胴体部１５１ｂの閉塞部１５１ｃによって覆われていない方の他端部は開口し、開口部１５３が形成される。胴体部１５１ｂ及び閉塞部１５１ｃにより、一端部が覆われた窪み部１５１ａが形成される。 The closing portion 151c covers one end of the body portion 151b in the longitudinal direction. The closed portion 151c has a substantially U-shaped cross section (specifically, a semicircular arc shape) in a cross section perpendicular to the first direction 15a. Further, the closed portion 151c is concentrically reduced in diameter on the side opposite to the body portion 151b. As shown in FIG. 9A, the outer shape of the closed portion 151c (that is, the closed end portion of the first sound deadening member 15) is a quarter arc shape in a side view. On the other hand, the other end of the body portion 151b that is not covered by the closing portion 151c is opened to form the opening portion 153. The body portion 151b and the closing portion 151c form a recess portion 151a whose one end is covered.

図１〜図３に示す取付け部１５２は、窪み部１５１ａの一端（図１においては上方に位置する端）の縁部に沿って位置する。換言すれば、取付け部１５２は、窪み部１５１ａの第１の方向１５ａ周りの周方向の縁部に沿って位置する。窪み部１５１ａがケーシング１０の内壁面で閉じられる（覆われる）ようにケーシング１０（具体的にはシェル部材１０１）の内壁面に取り付けられる。本実施形態では、取付け部１５２は、窪み部１５１ａの上記一端の縁部に沿って延びるフランジ状の部位である。そして、フランジ状の取付け部１５２がケーシング１０の内壁面に溶接等により接合される。これにより、窪み部１５１ａとケーシング１０の内壁面とにより覆われた空間である消音空間１５５が形成される。換言すれば、壁部１５１の内壁面とケーシング１０の内壁面との間に第１の方向１５ａに伸びる略半円柱状の消音空間１５５が形成される。 The mounting portion 152 shown in FIGS. 1 to 3 is located along the edge of one end (the upper end in FIG. 1) of the recessed portion 151a. In other words, the mounting portion 152 is located along the circumferential edge of the recessed portion 151a around the first direction 15a. The recess 151a is attached to the inner wall surface of the casing 10 (specifically, the shell member 101) so as to be closed (covered) by the inner wall surface of the casing 10. In the present embodiment, the mounting portion 152 is a flange-shaped portion extending along the edge portion of the one end of the recessed portion 151a. Then, the flange-shaped mounting portion 152 is joined to the inner wall surface of the casing 10 by welding or the like. As a result, a muffling space 155, which is a space covered by the recessed portion 151a and the inner wall surface of the casing 10, is formed. In other words, a substantially semi-cylindrical sound deadening space 155 extending in the first direction 15a is formed between the inner wall surface of the wall portion 151 and the inner wall surface of the casing 10.

開口部１５３は、消音空間１５５と、ケーシング１０の内壁面に囲まれた内部空間のうち消音空間１５５以外の空間と、を連通する。開口部１５３は、窪み部１５１ａ（胴体部１５１ｂ）における第１の方向１５ａの閉塞端部（閉塞部１５１ｃ）と反対側の端部に形成される。 The opening 153 communicates with the muffling space 155 and the space other than the muffling space 155 in the internal space surrounded by the inner wall surface of the casing 10. The opening 153 is formed at an end of the recess 151a (body portion 151b) opposite to the closing end (closing 151c) in the first direction 15a.

開口部１５３の開口面積は、消音空間１５５の断面積と略同一である。ここでいう消音空間１５５の断面積とは、消音空間１５５の第１の方向１５ａに垂直な断面であって、第１の方向１５ａの所定の位置における断面の断面積である。具体的には、ここでいう断面積は、胴体部１５１ｂを通過する断面の断面積である。特に、本実施形態では、胴体部１５１ｂの内径が第１の方向１５ａに沿って略一定であるため、上記断面積は、消音空間１５５の第１の方向１５ａに沿って断面積が略一定である部分の断面積ともいえる。なお、図８Ａでは、消音空間１５５の上記断面がハッチングにより示されている。 The opening area of the opening 153 is substantially the same as the cross-sectional area of the muffling space 155. The cross-sectional area of the muffling space 155 here is a cross section perpendicular to the first direction 15a of the muffling space 155, and is a cross-sectional area of the cross section at a predetermined position in the first direction 15a. Specifically, the cross-sectional area referred to here is the cross-sectional area of the cross section passing through the body portion 151b. In particular, in the present embodiment, since the inner diameter of the body portion 151b is substantially constant along the first direction 15a, the cross-sectional area is substantially constant along the first direction 15a of the muffling space 155. It can be said that it is the cross-sectional area of a certain part. In FIG. 8A, the cross section of the muffling space 155 is shown by hatching.

第２消音部材１６は、消音部材１５と形状及び大きさが同一である。第２消音部材１６は、第１消音部材１５の壁部１５１、取付け部１５２、開口部１５３、窪み部１５１ａ、胴体部１５１ｂ及び閉塞部１５１ｃにそれぞれ対応する構成として、壁部１６１、取付け部１６２、開口部１６３、窪み部１６１ａ、胴体部１６１ｂ及び閉塞部１６１ｃを備える。なお、第２消音部材１６は、直線状の第２の方向１６ａに沿って延在する。また、第２消音部材１６の窪み部１６１ａとケーシング１０の内壁面とにより覆われた空間である消音空間１６５が形成される。 The second muffling member 16 has the same shape and size as the muffling member 15. The second sound deadening member 16 has a wall portion 161 and a mounting portion 162, respectively, as a configuration corresponding to the wall portion 151, the mounting portion 152, the opening portion 153, the recessed portion 151a, the body portion 151b, and the closing portion 151c of the first sound deadening member 15. , An opening 163, a recess 161a, a body portion 161b and a closing portion 161c. The second muffling member 16 extends along the linear second direction 16a. Further, a muffling space 165, which is a space covered by the recessed portion 161a of the second muffling member 16 and the inner wall surface of the casing 10, is formed.

第１消音部材１５の第１の方向１５ａの長さＬ１と、第２消音部材１６の第２の方向１６ａの長さＬ２（Ｌ２＝Ｌ１）とは、マフラ１の特定周波数の共鳴音を低減するように設定される。具体的には、第１消音部材１５によるサイドブランチ型共鳴器の共鳴周波数Ｆｓは、Ｆｓ＝ｃ／（４×Ｌ１）で与えられる。ここで、ｃは音速である。この周波数Ｆｓが、マフラ１の共鳴音のｎ次モード（ｎは自然数）の周波数Ｆｎ（Ｆｎ＝（ｎ×ｃ）／（２×Ｌ））と一致するように消音部材１５，１６の長さＬ１，Ｌ２が設定される。なお、Ｌはマフラ１（ケーシング１０）の伸張方向１０ａの長さである。換言すれば、ｎ次モードの共鳴音の低減する場合、消音部材１５，１６の長さＬ１，Ｌ２は、およそＬ１＝Ｌ２＝（ｎ×Ｌ）／２に設定される。本実施形態では、消音部材１５，１６により周波数が１次モードである共鳴音を低減するため、消音部材１５，１６の長さＬ１，Ｌ２は、およそＬ１＝Ｌ２＝Ｌ／２となるように設定される。すなわち、消音部材１５，１６の長さＬ１，Ｌ２は、マフラ１の伸張方向１０ａの長さＬよりも短い。 The length L1 of the first muffling member 15 in the first direction 15a and the length L2 (L2 = L1) of the second muffling member 16 in the second direction 16a reduce the resonance sound of the specific frequency of the muffler 1. Is set to. Specifically, the resonance frequency Fs of the side branch type resonator by the first sound deadening member 15 is given by Fs = c / (4 × L1). Here, c is the speed of sound. The lengths of the muffling members 15 and 16 so that this frequency Fs matches the frequency Fn (Fn = (n × c) / (2 × L)) of the nth-order mode (n is a natural number) of the resonance sound of the muffler 1. L1 and L2 are set. L is the length of the muffler 1 (casing 10) in the extension direction 10a. In other words, when the resonance sound in the nth-order mode is reduced, the lengths L1 and L2 of the muffling members 15 and 16 are set to approximately L1 = L2 = (n × L) / 2. In the present embodiment, in order to reduce the resonance sound whose frequency is the primary mode by the muffling members 15 and 16, the lengths L1 and L2 of the muffling members 15 and 16 are set to be approximately L1 = L2 = L / 2. Set. That is, the lengths L1 and L2 of the sound deadening members 15 and 16 are shorter than the length L of the muffler 1 in the extension direction 10a.

また、本実施形態では、消音部材１５，１６は、シェル部材１０１の内壁面のうち、面積がより大きな面に取り付けられる。具体的には、シェル部材１０１の内壁面のうち、曲率半径が大きい２つの面（図３の左右両側に位置する面）の一方に消音部材１５，１６が配置される。 Further, in the present embodiment, the sound deadening members 15 and 16 are attached to the inner wall surface of the shell member 101 having a larger area. Specifically, the sound deadening members 15 and 16 are arranged on one of two surfaces having a large radius of curvature (surfaces located on both the left and right sides in FIG. 3) of the inner wall surface of the shell member 101.

また、消音部材１５，１６は、ケーシング１０の伸張方向１０ａに沿って延在するように配置される。換言すれば、第１消音部材１５の第１の方向１５ａと、第２消音部材１６の第２の方向１６ａと、がケーシング１０の伸張方向１０ａと略一致するように配置される。 Further, the sound deadening members 15 and 16 are arranged so as to extend along the extension direction 10a of the casing 10. In other words, the first direction 15a of the first sound deadening member 15 and the second direction 16a of the second sound deadening member 16 are arranged so as to substantially coincide with the extension direction 10a of the casing 10.

さらに、消音部材１５，１６の開口部１５３，１６３は、ケーシング１０の内部において、共鳴音の音圧の腹に位置するように配置される。
本実施形態では、第１消音部材１５は、その開口部１５３が後蓋部材１０３の内壁面の近傍（すなわち、一次モードの腹）に位置し、反対側の端部がマフラ１の長手方向の中央近傍（すなわち、一次モードの節）に位置するように配置される。他方、第２消音部材１６は、その開口部１６３が前蓋部材１０２の内壁面の近傍（すなわち、一次モードの腹）に位置し、反対側の端部がマフラ１の中央近傍（すなわち、一次モードの節）に位置するように配置される。なお、このように、開口部１５３，１６３を共鳴音の腹に配置するのは、低減される音圧を最大にできるからである。なお、図２には、１次モード及び２次モードの腹及び節の位置が模式的に示されている。 Further, the openings 153 and 163 of the sound deadening members 15 and 16 are arranged inside the casing 10 so as to be located at the antinode of the sound pressure of the resonance sound.
In the present embodiment, the opening 153 of the first muffling member 15 is located near the inner wall surface of the rear lid member 103 (that is, the antinode of the primary mode), and the opposite end is in the longitudinal direction of the muffler 1. It is arranged so as to be located near the center (that is, the node of the primary mode). On the other hand, the opening 163 of the second muffling member 16 is located near the inner wall surface of the front lid member 102 (that is, the antinode of the primary mode), and the opposite end is near the center of the muffler 1 (that is, the primary). It is arranged so that it is located in the mode section). The reason why the openings 153 and 163 are arranged at the antinodes of the resonance sound in this way is that the reduced sound pressure can be maximized. Note that FIG. 2 schematically shows the positions of the abdomen and nodes in the primary mode and the secondary mode.

［２．効果］
以上詳述した実施形態によれば、以下の効果が得られる。
（１）本実施形態では、マフラ１は、シェル部材１０１の内壁面に沿って配置された消音部材１５，１６を備える。したがって、消音部材１５の第１の方向１５ａの長さＬ１と消音部材１６の第２の方向１６ａの長さＬ２とを適切に設定することで、共鳴音と逆位相の音波を発生させ、共鳴音を低減できる。また、ケーシング１０の内壁面に沿って消音部材１５，１６が配置されるため、消音部材１５，１６がセパレータ１１，１２に搭載される構成と比較して、消音部材１５，１６の長さＬ１，Ｌ２を確保できる。よって、上記構成と比較して共鳴音を低減する効果を向上できる。さらには、消音部材１５，１６がケーシング１０の内壁面に取り付けられるため、ケーシング１０の剛性を向上させ、ケーシング１０の放射音を抑制できる。したがって、マフラ１で発生する共鳴音を低減する効果を向上するとともに放射音を抑制できる。 [2. effect]
According to the embodiment described in detail above, the following effects can be obtained.
(1) In the present embodiment, the muffler 1 includes sound deadening members 15 and 16 arranged along the inner wall surface of the shell member 101. Therefore, by appropriately setting the length L1 of the muffling member 15 in the first direction 15a and the length L2 of the muffling member 16 in the second direction 16a, a sound wave having a phase opposite to the resonance sound is generated and resonates. Sound can be reduced. Further, since the sound deadening members 15 and 16 are arranged along the inner wall surface of the casing 10, the length L1 of the sound deadening members 15 and 16 is compared with the configuration in which the sound deadening members 15 and 16 are mounted on the separators 11 and 12. , L2 can be secured. Therefore, the effect of reducing the resonance sound can be improved as compared with the above configuration. Further, since the sound deadening members 15 and 16 are attached to the inner wall surface of the casing 10, the rigidity of the casing 10 can be improved and the radiated sound of the casing 10 can be suppressed. Therefore, the effect of reducing the resonance sound generated by the muffler 1 can be improved and the radiated sound can be suppressed.

（２）本実施形態では、消音部材１５の窪み部１５１ａ，１６１ａの方向１５ａ，１６ａの一端部が覆われ、他端部に開口部１５３，１６３が形成されている。したがって、ケーシング１０の伸張方向１０ａの両端部の近傍に位置する、共鳴音の音圧の腹に開口部１５３，１６３を配置しやすい。よって、共鳴音を効果的に低減でき得る。 (2) In the present embodiment, one end of the recessed portions 151a, 161a of the sound deadening member 15 in the directions 15a, 16a is covered, and openings 153, 163 are formed at the other end. Therefore, it is easy to arrange the openings 153 and 163 on the antinodes of the sound pressure of the resonance sound, which are located near both ends of the casing 10 in the extension direction 10a. Therefore, the resonance sound can be effectively reduced.

（３）本実施形態では、消音部材１５，１６は、壁部１５１，１６１の延在方向（すなわち、方向１５ａ，１６ａ）がケーシング１０の伸張方向１０ａと一致するように配置される。したがって、消音部材１５，１６が、壁部１５１，１６１の延在方向とケーシング１０の伸張方向１０ａとが一致しないように配置される構成（例えば壁部１５１，１６１の延在方向が伸張方向１０ａに対して垂直である構成）と比較して、ケーシング１０の剛性を向上できる。よって、上記構成と比較して、放射音を抑制できる。 (3) In the present embodiment, the sound deadening members 15 and 16 are arranged so that the extending directions (that is, the directions 15a and 16a) of the wall portions 151 and 161 coincide with the extending direction 10a of the casing 10. Therefore, the sound deadening members 15 and 16 are arranged so that the extending direction of the wall portions 151 and 161 and the extending direction 10a of the casing 10 do not coincide with each other (for example, the extending direction of the wall portions 151 and 161 is the extending direction 10a). The rigidity of the casing 10 can be improved as compared with the configuration that is perpendicular to the casing 10. Therefore, the radiated sound can be suppressed as compared with the above configuration.

（４）本実施形態では、消音部材１５，１６のフランジ状の取付け部１５２，１６２がケーシング１０の内壁面に接合されている。
したがって、消音部材１５，１６がフランジ状の取付け部１５２，１６２を有しない構成と比較して、消音部材１５，１６とケーシング１０の内壁面との接触面積を向上できる。したがって、上記構成と比較して、ケーシング１０の剛性を向上させ、放射音を抑制できる。 (4) In the present embodiment, the flange-shaped mounting portions 152 and 162 of the sound deadening members 15 and 16 are joined to the inner wall surface of the casing 10.
Therefore, the contact area between the sound deadening members 15 and 16 and the inner wall surface of the casing 10 can be improved as compared with the configuration in which the sound deadening members 15 and 16 do not have the flange-shaped mounting portions 152 and 162. Therefore, as compared with the above configuration, the rigidity of the casing 10 can be improved and the radiated sound can be suppressed.

（５）本実施形態では、セパレータ１１，１２のフランジ部１１２，１２２がケーシング１０の内壁面に接合されている。また、例えばセパレータ１１については、セパレータ１１の凹部１１３により形成される挿通空間１１４ａに第１消音部材１５の窪み部１５１ａ及び取付け部１５２が通されている。 (5) In the present embodiment, the flange portions 112 and 122 of the separators 11 and 12 are joined to the inner wall surface of the casing 10. Further, for example, for the separator 11, the recessed portion 151a and the mounting portion 152 of the first sound deadening member 15 are passed through the insertion space 114a formed by the recess 113 of the separator 11.

したがって、セパレータ１１と消音部材１５との組付け性を向上させることができる。また、セパレータ１１，１２がフランジ部１１２，１２２を有しない構成と比較して、セパレータ１１，１２とケーシング１０の内壁面との接触面積を向上できる。したがって、上記構成と比較して、ケーシング１０の剛性を向上させ、放射音を抑制できる。 Therefore, the assembling property between the separator 11 and the sound deadening member 15 can be improved. Further, the contact area between the separators 11 and 12 and the inner wall surface of the casing 10 can be improved as compared with the configuration in which the separators 11 and 12 do not have the flange portions 112 and 122. Therefore, as compared with the above configuration, the rigidity of the casing 10 can be improved and the radiated sound can be suppressed.

［３．他の実施形態］
以上、本開示を実施するための形態について説明したが、本開示は上述の実施形態に限定されることなく、種々変形して実施することができる。 [3. Other embodiments]
Although the embodiment for carrying out the present disclosure has been described above, the present disclosure is not limited to the above-described embodiment, and can be implemented in various modifications.

（１）ケーシングの形状は上記実施形態の形状に限られない。例えば、シェル部材の伸張方向１０ａに垂直な断面形状は、楕円状以外の形状であってもよく、真円状、多角形状等であってもよい。 (1) The shape of the casing is not limited to the shape of the above embodiment. For example, the cross-sectional shape perpendicular to the extension direction 10a of the shell member may be a shape other than an ellipse, a perfect circle, a polygonal shape, or the like.

（２）上記実施形態において、シェル部材１０１、前蓋部材１０２及び後蓋部材１０３は互いに一体成形されていてもよい。また、上記実施形態では、ケーシング１０は、シェル部材１０１、前蓋部材１０２及び後蓋部材１０３の３部材から構成されるが、ケーシングの構成はこれに限られない。例えば、ケーシングは、当該ケーシングの下部を形成する下ケースと、当該ケーシングの上部を形成する上ケースと、の２部材から構成されていてもよい。 (2) In the above embodiment, the shell member 101, the front lid member 102, and the rear lid member 103 may be integrally molded with each other. Further, in the above embodiment, the casing 10 is composed of three members, a shell member 101, a front lid member 102, and a rear lid member 103, but the casing configuration is not limited to this. For example, the casing may be composed of two members, a lower case forming the lower part of the casing and an upper case forming the upper part of the casing.

（３）上記実施形態において、マフラは、１つのセパレータを備えていてもよい。またマフラは、２つ以外の複数のセパレータを備えていてもよい。
（４）例えば、第１消音部材１５には、開口部１５３とは別の少なくとも１つの開口（小孔）が形成されていてもよい。この場合において、例えば第１消音部材１５における第１の方向１５ａの覆われた一端部（閉塞部１５１ｃ）に、少なくとも１つの開口が形成されていてもよい。例えば、図５に示す丸で囲まれた部分に少なくとも１つの開口が形成されていてもよい。少なくとも１つの開口は、消音空間１５５とケーシング１０の内部空間のうち消音空間１５５以外の空間とを連通する。また、少なくとも１つの開口の開口面積は、開口部１５３の開口面積よりも小さい（この例では、開口部１５３の開口面積よりも極めて小さい。）。 (3) In the above embodiment, the muffler may include one separator. Further, the muffler may include a plurality of separators other than the two.
(4) For example, the first sound deadening member 15 may be formed with at least one opening (small hole) different from the opening 153. In this case, for example, at least one opening may be formed in the covered one end portion (closing portion 151c) of the first sound deadening member 15 in the first direction 15a. For example, at least one opening may be formed in the circled portion shown in FIG. At least one opening communicates the muffling space 155 and the space inside the casing 10 other than the muffling space 155. Also, the opening area of at least one opening is smaller than the opening area of the opening 153 (in this example, it is much smaller than the opening area of the opening 153).

このような構成によれば、第１消音部材１５の上記一端部に少なくとも１つの開口が形成されていない構成と比較して、より広い周波数帯域の排気音を減衰できることが実験によりわかる。なお、開口の位置は閉塞部１５１ｃに限られない。例えば、少なくとも１つの開口は、第１消音部材１５の第１の方向１５ａの中央部やその他の箇所に形成されていてもよい。 It can be experimentally found that according to such a configuration, the exhaust sound in a wider frequency band can be attenuated as compared with the configuration in which at least one opening is not formed at the one end portion of the first sound deadening member 15. The position of the opening is not limited to the closing portion 151c. For example, at least one opening may be formed in the central portion of the first sound deadening member 15 in the first direction 15a or at other locations.

（５）消音部材は、図６に示すような構成でもよい。すなわち、図６に示す消音部材１７は、窪み部１７１ａにおける第３の方向１７ａの両端部が覆われている。そして、開口部１７３が、壁部１７１における窪み部１７１ａを形成する部分の第３の方向１７ａの中央部（例えば図中、丸で囲まれた部分）に形成されている。なお、開口部１７３の開口面積は、消音空間１７５の断面積（例えば図中のＡ−Ａ断面の断面積）と略同一である。 (5) The muffling member may have a configuration as shown in FIG. That is, the sound deadening member 17 shown in FIG. 6 covers both ends of the recessed portion 171a in the third direction 17a. Then, the opening 173 is formed in the central portion (for example, the portion circled in the drawing) in the third direction 17a of the portion forming the recessed portion 171a in the wall portion 171. The opening area of the opening 173 is substantially the same as the cross-sectional area of the muffling space 175 (for example, the cross-sectional area of the AA cross section in the drawing).

このような構成によれば、ケーシング１０における伸張方向１０ａの中央部の近傍に位置する、共鳴音の音圧の腹（例えば図２に示す２次モードの腹）に開口部１７３を配置しやすい。よって、共鳴音を効果的に低減でき得る。 According to such a configuration, it is easy to arrange the opening 173 in the antinode of the sound pressure of the resonance sound (for example, the antinode of the secondary mode shown in FIG. 2) located near the central portion of the casing 10 in the extension direction 10a. .. Therefore, the resonance sound can be effectively reduced.

また例えば、一端部が覆われ、他端部に開口部が形成された消音部材を用いて２次モードの共鳴音を低減するためには、上記２つの消音部材の開口部を２次モードの腹（すなわち、ケーシング１０における伸張方向１０ａの中央部）でつき合わせて配置することが考えられる。この場合、２つの消音部材が必要であり、また、マフラの製造工程において２つの消音部材を突き合わせて配置する作業が発生する。これに対して、消音部材１７によれば、２つの消音部材を突き合わせ作業は不要であり、１つの消音部材１７を配置すればよい。よって、特定周波数の共鳴音を低減可能なマフラを製造する際に、部品点数を削減できるとともに作業工数を低減できる。 Further, for example, in order to reduce the resonance sound in the secondary mode by using a sound deadening member in which one end is covered and an opening is formed in the other end, the openings of the above two sound deadening members are set in the secondary mode. It is conceivable to arrange them so that they meet each other on the belly (that is, the central portion of the casing 10 in the extension direction 10a). In this case, two sound deadening members are required, and in the manufacturing process of the muffler, the work of arranging the two sound deadening members abutting each other is required. On the other hand, according to the muffling member 17, it is not necessary to butt the two muffling members, and one muffling member 17 may be arranged. Therefore, when manufacturing a muffler capable of reducing the resonance sound of a specific frequency, the number of parts can be reduced and the work man-hours can be reduced.

（６）例えば、消音部材は、図７に示すような構成でもよい。図７に示す消音部材１８は、第４の方向１８ａに沿って窪み部１８１ａを形成する板状の壁部１８１を備える。窪み部１８１ａは、小窪み部１８１ｂと、大窪み部１８１ｃと、を有する。 (6) For example, the muffling member may have a configuration as shown in FIG. The muffling member 18 shown in FIG. 7 includes a plate-shaped wall portion 181 forming a recessed portion 181a along the fourth direction 18a. The recessed portion 181a has a small recessed portion 181b and a large recessed portion 181c.

小窪み部１８１ｂ及び大窪み部１８１ｃは、窪みの形状及び大きさが第４の方向１８ａに沿って略同一である。大窪み部１８１ｃは、小窪み部１８１ｂと第４の方向１８ａにおいて連続し、小窪み部１８１ｂよりも大きく窪んでいる。大窪み部１８１ｃにおける第４の方向１８ａの端部であって小窪み部１８１ｂと反対側の端部は覆われている。また、小窪み部１８１ｂにおける第４の方向１８ａの端部であって大窪み部１８１ｃと反対側の端部には、開口部１８３が形成されている。この開口部１８３は、窪み部１８１ａとケーシング１０の内壁面とに覆われた空間である消音空間１８５と、ケーシング１０の内部空間のうち消音空間以外の空間と、を連通する。なお、開口部１８３の開口面積は、小部分空間１８３ａの断面積と略同一である。小部分空間１５５ａは、消音空間１８５の一部であって、小窪み部１８１ｂとケーシング１０の内壁面とに覆われた空間として形成される。 The small recess 181b and the large recess 181c have substantially the same shape and size of the recess along the fourth direction 18a. The large recessed portion 181c is continuous with the small recessed portion 181b in the fourth direction 18a, and is recessed larger than the small recessed portion 181b. The end of the large recess 181c in the fourth direction 18a, which is opposite to the small recess 181b, is covered. Further, an opening 183 is formed at the end of the small recess 181b in the fourth direction 18a and opposite to the large recess 181c. The opening 183 communicates the sound deadening space 185, which is a space covered with the recessed portion 181a and the inner wall surface of the casing 10, and the space inside the casing 10 other than the sound deadening space. The opening area of the opening 183 is substantially the same as the cross-sectional area of the small subspace 183a. The small subspace 155a is a part of the muffling space 185, and is formed as a space covered by the small recess 181b and the inner wall surface of the casing 10.

このような構成によれば、消音部材１８をケーシング１０の内壁面に取り付けることにより、ヘルムホルツ共鳴器を形成できる。このため、特定の周波数の共鳴音を減衰可能となる。なお、上記の例において、小径胴体部１８１ａ及び大窪み部１８１ｃの形状及び大きさは第４の方向１８ａに沿って一定でなくてもよい。 According to such a configuration, the Helmholtz resonator can be formed by attaching the sound deadening member 18 to the inner wall surface of the casing 10. Therefore, the resonance sound of a specific frequency can be attenuated. In the above example, the shapes and sizes of the small-diameter body portion 181a and the large recessed portion 181c do not have to be constant along the fourth direction 18a.

（７）消音部材の断面形状は上記実施形態の形状に限られない。例えば、図８Ｂに示すように、消音部材の断面形状は矩形状（より一般には多角形状）であってもよい。また例えば、図８Ｃに示すように、消音部材の断面形状は波打った形状、具体的には、略Ｍ字状であってもよい。また消音部材の断面形状は、上記以外の任意の曲線形状であってもよい。 (7) The cross-sectional shape of the sound deadening member is not limited to the shape of the above embodiment. For example, as shown in FIG. 8B, the cross-sectional shape of the sound deadening member may be rectangular (more generally polygonal). Further, for example, as shown in FIG. 8C, the cross-sectional shape of the sound deadening member may be a wavy shape, specifically, a substantially M shape. Further, the cross-sectional shape of the sound deadening member may be any curved shape other than the above.

（８）消音部材の閉塞端部の形状は上記実施形態のものに限られない。例えば、図９Ｂに示すように、閉塞端部の外形は側面視で直角状であってもよい。また、図９Ｃに示すように、閉塞端部の外形は側面視で折れ線状であってもよい。 (8) The shape of the closed end portion of the sound deadening member is not limited to that of the above embodiment. For example, as shown in FIG. 9B, the outer shape of the closed end portion may be right-angled in a side view. Further, as shown in FIG. 9C, the outer shape of the closed end portion may be a polygonal line in a side view.

（９）消音部材の配置の仕方は上記実施形態のものに限られない。例えば、消音部材１５，１６のケーシング１０の伸張方向１０ａの位置を変化させてもよい。例えば、図１０に示すように、開口部１５３，１６３が２次モードの腹（ケーシング１０の伸張方向１０ａの中央部）に配置するようにしてもよい。なお、この場合、第１消音部材１５の閉塞端部が伸張方向１０ａの一方側を向くように配置され、第２消音部材１６の閉塞端部が伸張方向１０ａの他方側を向くように配置される。 (9) The method of arranging the sound deadening member is not limited to that of the above embodiment. For example, the positions of the casings 10 of the sound deadening members 15 and 16 in the extension direction 10a may be changed. For example, as shown in FIG. 10, the openings 153 and 163 may be arranged in the antinode of the secondary mode (the central portion of the casing 10 in the extension direction 10a). In this case, the closed end portion of the first muffling member 15 is arranged so as to face one side in the extension direction 10a, and the closed end portion of the second muffling member 16 is arranged so as to face the other side in the extension direction 10a. NS.

また例えば、図１１に示すように、消音部材１５，１６の延在方向（第１の方向１５ａ及び第２の方向１６ａ）がケーシング１０の伸張方向１０ａと一致しないように消音部材１５，１６が配置されてもよい。図１１に示す例では、消音部材１５は、第１の方向１５ａが伸張方向１０ａと直角になるように配置される。また、消音部材１６は、第２の方向１６ａが伸張方向１０ａと直角以外の角度をなすように配置される。 Further, for example, as shown in FIG. 11, the sound deadening members 15 and 16 are arranged so that the extending directions (first direction 15a and second direction 16a) of the sound deadening members 15 and 16 do not coincide with the extension direction 10a of the casing 10. It may be arranged. In the example shown in FIG. 11, the sound deadening member 15 is arranged so that the first direction 15a is perpendicular to the extension direction 10a. Further, the sound deadening member 16 is arranged so that the second direction 16a forms an angle other than a right angle with the extension direction 10a.

また例えば、図１２に示す消音部材２１〜２３のように、消音部材のケーシング１０の短手方向１０ｂ及び鉛直方向１０ｃの位置は任意であってもよい。
（１０）上記実施形態では、消音部材１５，１６は、一直線状の方向１５ａ，１６ａに沿って延在するが、消音部材の形状はこれに限られない。例えば、図１３に示す消音部材１９，２０は、一直線状以外の方向１９ａ，２０ａに沿って延在する。なお、図１２に示す例では、方向１９ａ，２０ａはＬ字状である。また、消音部材は、曲線状の方向に沿って延在する形状でもよい。 Further, for example, as in the sound deadening members 21 to 23 shown in FIG. 12, the positions of the casing 10 of the sound deadening member in the lateral direction 10b and the vertical direction 10c may be arbitrary.
(10) In the above embodiment, the muffling members 15 and 16 extend along the linear directions 15a and 16a, but the shape of the muffling member is not limited to this. For example, the muffling members 19 and 20 shown in FIG. 13 extend along directions 19a and 20a other than a straight line. In the example shown in FIG. 12, the directions 19a and 20a are L-shaped. Further, the muffling member may have a shape extending along a curved direction.

（１１）例えば、図１４に示すようにセパレータ２１に連通孔等の孔部がない場合、共鳴音の音圧の腹がセパレータ２１の近傍に発生する。この場合、消音部材１５の開口部１５３がセパレータ２１の近傍に位置するように消音部材１５が配置されてもよい。セパレータの孔部が極小さい場合も同様である。 (11) For example, when the separator 21 does not have a hole such as a communication hole as shown in FIG. 14, the antinode of the sound pressure of the resonance sound is generated in the vicinity of the separator 21. In this case, the sound deadening member 15 may be arranged so that the opening 153 of the sound deadening member 15 is located in the vicinity of the separator 21. The same applies when the hole of the separator is extremely small.

（１２）例えば、マフラ１は、消音部材１５，１６とケーシング１０の内壁面との間、及び、消音部材１５，１６とセパレータ１１，１２との間、の少なくとも一方に配置された弾性変形可能な弾性部材を備えてもよい。例えば、第１消音部材１５の取付け部１５２とシェル部材１０１の内壁面との間（例えば図１５Ａの符号１０ｄの丸で囲まれた部分）に、図１５Ｂで示すように弾性部材２２１を設けてもよい。なお、この例では、取付け部１５２は、他の部材（弾性部材２２１）を介して間接的にシェル部材１０１の内壁面に取り付けられる。また例えば、第１消音部材１５と第１セパレータ１１との間に（例えば図１５Ａの符号１０ｅの丸で囲まれた部分）に、図１５Ｃで示すように弾性部材２２２を設けてもよい。なお、弾性部材２２１，２２２としては、例えばワイヤメッシュが使用される。 (12) For example, the muffler 1 is elastically deformable arranged at least one of the sound deadening members 15 and 16 and the inner wall surface of the casing 10 and between the sound deadening members 15 and 16 and the separators 11 and 12. Elastic member may be provided. For example, an elastic member 221 is provided between the mounting portion 152 of the first sound deadening member 15 and the inner wall surface of the shell member 101 (for example, the portion circled by reference numeral 10d in FIG. 15A) as shown in FIG. 15B. May be good. In this example, the mounting portion 152 is indirectly mounted on the inner wall surface of the shell member 101 via another member (elastic member 221). Further, for example, an elastic member 222 may be provided between the first sound deadening member 15 and the first separator 11 (for example, a portion circled by reference numeral 10e in FIG. 15A) as shown in FIG. 15C. As the elastic members 221,222, for example, a wire mesh is used.

このような構成によれば、弾性部材２２１，２２２がケーシング１０の振動を吸収するダンパーとして作用するため、放射音を抑制できる。また、弾性部材２２１，２２２を弾性変形させて各部材１０１，１１，１５の相対位置を適宜調節できるため、各部材１０１，１１，１５の組付け性を向上できる。 According to such a configuration, since the elastic members 221,222 act as a damper that absorbs the vibration of the casing 10, the radiated sound can be suppressed. Further, since the elastic members 221,222 can be elastically deformed to appropriately adjust the relative positions of the members 101,11,15, the assembling property of the members 101,11,15 can be improved.

（１３）例えば、図１６Ａ及び図１６Ｂに示す消音部材２３をマフラに搭載することで、１つの部材２３で、消音部材１５，１６のような消音部材を２つ搭載した場合と同様の効果を奏することができる。すなわち、消音部材２３は、第５の方向２３ａに沿って延在する壁部２３１を有する。壁部２３１は、図１６Ｂに示すように、消音部材２３がケーシング１０の内壁面に取り付けられた状態において、ケーシング１０の内壁面に当接する当接部２３２を有する。当接部２３２は、壁部２３１における第５の方向２３ａの両端部以外の箇所（例えば第５の方向２３ａの中央部）に位置する。すなわち、当接部２３２の第５の方向２３ａの一方の隣に窪み部２３１ａが形成され、他方の隣に３１ｂが形成されている。また、窪み部２３１ａ，２３１ｂの当接部２３２と反対側の端部にはそれぞれ開口部２３３ａ，２３３ｂが形成されている。このような構成によれば、壁部２３１とケーシング１０の内壁面との間に、当接部２３２を挟んで２つの消音空間２３５ａ，２３５ｂを形成可能である。 (13) For example, by mounting the muffling member 23 shown in FIGS. 16A and 16B on the muffler, the same effect as when two muffling members such as the muffling members 15 and 16 are mounted on one member 23 can be obtained. Can play. That is, the muffling member 23 has a wall portion 231 extending along the fifth direction 23a. As shown in FIG. 16B, the wall portion 231 has an abutting portion 232 that abuts on the inner wall surface of the casing 10 in a state where the sound deadening member 23 is attached to the inner wall surface of the casing 10. The contact portion 232 is located on the wall portion 231 at a location other than both ends in the fifth direction 23a (for example, the central portion in the fifth direction 23a). That is, a recessed portion 231a is formed next to one of the fifth directions 23a of the contact portion 232, and a 31b is formed next to the other. Further, openings 233a and 233b are formed at the ends of the recesses 231a and 231b on the opposite side of the contact portion 232, respectively. According to such a configuration, two sound deadening spaces 235a and 235b can be formed between the wall portion 231 and the inner wall surface of the casing 10 with the contact portion 232 interposed therebetween.

（１４）上記実施形態では、胴体部１５１ｂ，１６１ｂの内径は、方向１５ａ，１６ａに沿って一定であるが、胴体部の形状はこれに限られない。例えば、胴体部の内径は、前記方向に沿って一定でなくてもよい。この場合も、開口部の開口面積は、消音空間の前記方向における所定の位置での断面積と略同一であってもよい。 (14) In the above embodiment, the inner diameters of the body portions 151b and 161b are constant along the directions 15a and 16a, but the shape of the body portion is not limited to this. For example, the inner diameter of the body portion does not have to be constant along the above direction. In this case as well, the opening area of the opening may be substantially the same as the cross-sectional area of the sound deadening space at a predetermined position in the above direction.

（１５）上記実施形態において、消音部材１５，１６の取付け部１５２，１５３は、フランジ状でなくてもよい。
（１６）上記実施形態において、マフラは、１つの消音部材を備えていてもよい。またマフラは、２つ以外の複数の消音部材を備えていてもよい。 (15) In the above embodiment, the mounting portions 152 and 153 of the sound deadening members 15 and 16 do not have to be flange-shaped.
(16) In the above embodiment, the muffler may include one muffling member. Further, the muffler may include a plurality of sound deadening members other than the two.

（１７）上記実施形態において、マフラ１は、インレットパイプ１３及びアウトレットパイプ１４の２本のパイプを備えるが、パイプの数はこれに限られない。マフラ１は、１つ又は２つ以外の複数のパイプを備えていてもよい。 (17) In the above embodiment, the muffler 1 includes two pipes, an inlet pipe 13 and an outlet pipe 14, but the number of pipes is not limited to this. The muffler 1 may include a plurality of pipes other than one or two.

（１８）上記実施形態において第１消音部材１５の第１の方向１５ａの長さＬ１と、第２消音部材１６の第２の方向１６ａの長さＬ２と、が互いに相違していてもよい。このような構成によれば、マフラが消音部材を１つだけ備える構成と比較して、共鳴音を一層抑制できる。また、消音空間１５５，１６５の長さＬ１，Ｌ２を適宜調節することで、複数の振動モードの共鳴音を抑制できる。 (18) In the above embodiment, the length L1 of the first sound deadening member 15 in the first direction 15a and the length L2 of the second sound deadening member 16 in the second direction 16a may be different from each other. According to such a configuration, the resonance sound can be further suppressed as compared with the configuration in which the muffler includes only one sound deadening member. Further, by appropriately adjusting the lengths L1 and L2 of the muffling spaces 155 and 165, the resonance sound of a plurality of vibration modes can be suppressed.

（１９）上記実施形態では、ケーシング１０と消音部材１５，１６とは別部材であるが、ケーシングと消音部材とは一体化されていてもよい。例えば、ケーシングの壁部を内側及び外側の２重に形成し、内側の壁部を内側に窪ませることで、消音空間を形成してもよい。すなわち、内側の壁部における上記窪ませた部位を消音部材として機能させてもよい。 (19) In the above embodiment, the casing 10 and the sound deadening members 15 and 16 are separate members, but the casing and the sound deadening member may be integrated. For example, a muffling space may be formed by forming the wall portion of the casing twice on the inner side and the outer side and denting the inner wall portion inward. That is, the recessed portion of the inner wall portion may function as a sound deadening member.

（２０）上記実施形態における１つの構成要素が有する複数の機能を、複数の構成要素によって実現したり、１つの構成要素が有する１つの機能を、複数の構成要素によって実現したりしてもよい。また、複数の構成要素が有する複数の機能を、１つの構成要素によって実現したり、複数の構成要素によって実現される１つの機能を、１つの構成要素によって実現したりしてもよい。また、上記実施形態の構成の一部を省略してもよい。また、上記実施形態の構成の少なくとも一部を、他の上記実施形態の構成に対して付加又は置換してもよい。なお、特許請求の範囲に記載した文言によって特定される技術思想に含まれるあらゆる態様が本開示の実施形態である。 (20) A plurality of functions possessed by one component in the above embodiment may be realized by a plurality of components, or one function possessed by one component may be realized by a plurality of components. .. Further, a plurality of functions possessed by the plurality of components may be realized by one component, or one function realized by the plurality of components may be realized by one component. Further, a part of the configuration of the above embodiment may be omitted. In addition, at least a part of the configuration of the above embodiment may be added or replaced with the configuration of the other above embodiment. It should be noted that all aspects included in the technical idea specified by the wording described in the claims are embodiments of the present disclosure.

１…マフラ、１０…ケーシング、
１５，１６，１７，１８，１９，２１，２３…消音部材、
１０１…シェル部材、１５２，１６２…取付け部、
１５３，１６３，１７３，２３３ａ，２３３ｂ…開口部、
１５５，１６５，１７５，２３５ａ，２３５ｂ…消音空間、
１５１ａ，１６１ｂ，１７１ａ，１８１ａ，２３１ａ，２３１ａ…窪み部。 1 ... muffler, 10 ... casing,
15, 16, 17, 18, 19, 21, 23 ... Silent member,
101 ... Shell member, 152, 162 ... Mounting part,
153,163,173,233a, 233b ... opening,
155,165,175,235a, 235b ... Silent space,
151a, 161b, 171a, 181a, 231a, 231a ... Recessed portion.

Claims

A casing that has an exhaust flow path inside to reduce exhaust noise,
A sound deadening member arranged along the inner wall surface of the casing,
With
The sound deadening member
A plate-shaped wall portion extending along the first direction of the inner wall surface and forming a recessed portion along the first direction, and a plate-shaped wall portion.
An opening that communicates a muffling space formed in the wall portion and covered by the recessed portion and the inner wall surface, and an internal space surrounded by the inner wall surface other than the muffling space. When,
With
The wall portion is formed by forming a small recess portion, a large recess portion that is continuous with the small recess portion in the first direction and is recessed larger than the small recess portion, as the recess portion.
A muffler having an opening formed at an end of the small recess on the opposite side of the large recess in the first direction.

The muffler according to claim 1.
A muffler in which one end of the recess in the first direction is covered and the opening is formed at the other end.

The muffler according to claim 1 or 2.
A muffler in which the opening area of the opening is substantially the same as the cross-sectional area of the muffling space in a cross section perpendicular to the first direction.

The muffler according to any one of claims 1 to 3.
The muffler includes the wall portion whose first direction is linear, and is arranged so that the extending direction of the wall portion coincides with the extending direction of the casing.

The muffler according to any one of claims 1 to 4.
The sound deadening member includes a flange-shaped mounting portion that extends along the edge of one end of the recess.
A muffler in which the mounting portion is joined to the inner wall surface.

The muffler according to any one of claims 1 to 5.
Further provided with a separator for partitioning the internal space surrounded by the inner wall surface,
The separator is
A flange portion provided along the outer edge portion of the separator and a flange portion
A recess for forming an insertion space, which is a space for passing the sound deadening member, between the inner wall surface and the inner wall surface.
Have,
A muffler in which the flange portion is joined to the inner wall surface and the sound deadening member is passed through the insertion space.

The muffler according to claim 6.
A muffler further comprising an elastic member arranged at least one of the sound deadening member and the inner wall surface and between the sound deadening member and the separator.

The muffler according to any one of claims 1 to 7.
Further provided with additional muffling members arranged along the inner wall surface.
The additional muffling member
A plate-shaped wall portion extending along the second direction of the inner wall surface and forming a recessed portion along the second direction, and a plate-shaped wall portion.
An additional muffling space formed on the wall portion of the additional muffling member and covered by the recessed portion and the inner wall surface of the additional muffling member, and the additional muffling space of the internal space. With spaces other than, and openings that communicate with each other,
Muffler with.